Cutting and edge-compacting member for cutting-machines.



No. 898,259. 7 PATENTED SEPT. 8, 1908. A. P. PRESTON. f

CUTTING AND EDGE GOMPAGTING MEMBER FOR GUTTLNG MAOHINES.

- APPLICATION FILED JAN 16, 1908.

jia i Y 5 5.

UNITED STATES PATENT OFFICE.

ALBERT F. PRESTON, OF BOSTON, MASSACHUSETTS.

CUTTING AND EDGE-COMPAGTIN G MEMBER FOR CUTTING-MACHINES.

Application filed January 16, 1908.

To all whom it may concern:

Be it known that I, ALBERT F. PRESTON, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Cutting and Edge-Compacting Members for Cutting-Machines, of which the following is a specification.

This invention relates to machines for cutting relatively thick sheetmaterial, such as thick heavy paperboard used for making patterns ofparts of boot and shoe uppers.

The invention has for its object to provide a machine adapted to formtwo opposed grooves in opposite sides of a sheet of nonmetallicmaterial, said grooves resulting in the severance of the sheet, and toso compact the material displaced in forming the grooves as to preventthe formation of burs or ridges along the edges of the severed parts ofthe sheet.

The invention is embodied in a pair of cutting and edge-compactingmembers comprising opposed disk knives adapted to form coincidinggrooves in opposite sides of a sheet, and means accompanying the knivesfor confining and compacting the material displaced by the knives informing the grooves, 110 obstacle being presented, however, to the freeturning of the work in different directions as it proceeds between theknives and compacting means, the displaced material being prevented frombulging outwardly from the sides of the sheet, so that the edges, formedby conjoint action of the knives, have the same thickness along eitherstraight or curved edges of the pattern as the body of the sheet. Thesaid cutting and edge-compacting members constitute a part of anorganized cutting machine which is described and claimed in myapplication for Letters Patent of the United States, filed December 9,1907, Serial No. 405,657.

Of the accompanying drawings forming a part of this specification,Figure 1 represents a sectional view of a pair of cutting andedgecompacting members embodying my invention. Figs. 2, 3 and 4,represent similar views showing different embodiments of the invention.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, 16 and 17 represent shafts which are located side byside and are j ournaled in bearings 23 and 24 which are or may bemovable on a supporting frame, as shown Specification of Letters Patent.

Patented Sept. 8, 1908 Serial No. 411,033.

in my above-mentioned application, so that the disk cutters 18, 18 whichare affiXed to said shafts by screws 19 may be moved toward and fromeach other.

Each cutter is provided on its opposite sides with beveled faces 20,these faces meeting to form peripheral cutting edges. Means areprovided, as shown in said application, for rotating the shaftssimultaneously in opposite directions.

The preferred relative arrangement of the knives is such that thebeveled inner face of one knife slightly overlaps the beveled outer faceof the other knife, the said beveled faces being in close rubbingcontact with each other. The knives are adapted to form coincidinggrooves in opposite sides of a sheet 27 to be severed, the formation ofsaid grooves resulting in the severance of the sheet.

I have found that displacement of the material by the beveled sides ofthe knives is such that burs or raised ridges are formed on the edges ofthe severed parts, when the knives are used in the manner shown in myformer application. In carrying out the present invention, I providemeans for confining and compacting the material displaced by the knivesin such manner as to prevent the formation of said burs or ridges, andleave the edges of the severed parts of the same thickness as the bodyof the sheet. The said compacting means are preferably pressure rolls 29located beside the disk knives, and adapted to bear simultaneously onopposite sides of the sheet 27. The rolls 29 are intimately associatedwith the disk knives although separate therefrom so that the knives androlls practically form a single part or structure, the inner ends of theperipheries of the rolls meeting the sides 20 of the disk knives withoutinterruption. The peripheries of the rolls and the beveled sides of theknives therefore form obtuse angles, as shown in the drawings. Theperipheries of the rolls are concentric with the cutting edges of theknives and the rolls rotate with the knives. The nip of the rolls istherefore directly beside and in close proximity to the acting portionsof the knives which form the coinciding grooves in the sheet 27. Thediameter of the rolls is such that the space between them at the nip ofthe rolls preferably does not exceed the thickness of the sheet 27. Itwill be seen therefore, that, when the machine is in operation, the diskknives form coinciding V- shaped grooves in the sheet 27, and that thematerial of the sheet, which is displaced by the formation of saidgrooves, instead of bulging outwardly, as' shown at 28 in Fig. 5, isconfined and compacted by the rolls-29, so that the edge formed by theaction of the cutters is of practically the same thickness as the bodyof the sheet.

The rolls may be constructed and connected with the knives in anysuitable way, and each knife may have a roll at one or both sides of itscutting edge. In Figs. 1 and 2, I show one pair of rolls, these beinglocated at the outer sides of the cutting edges of the knives. Thisconstruction is suitable for use when the knives are used simply fortrimming a surplus edge or waste piece from the sheet of material wherethe part removed from the sheet does not require compression andcompacting. In Figs. 3 and 4, I show a pair of rolls accompanying eachknife, the rolls being at opposite sides of the cutting edge of theknife, so that the edges of the two pieces severed by the action of theknife are simultaneously compacted and compressed.

The rolls may be in separate pieces from the knives as shown in Figs. 1and 3, or integral therewith as shown in Figs. 2 and 4.

When the rolls are made as separate parts, they are adapted to rotateloosely so that their rotation may be independent of that of the knives,when the Work is being turned to form a curved cut and a correspondinglycurved edge on the pattern, or other article formed by the cutters.Under these circumstances, the rolls will rotate more rapidly when theyare at the concave side of a curved out than when they are at the convexside, the speed of the rolls corresponding to the speed of the sheetpassing between them. The friction developed between the rolls and. thesheet is therefore reduced to the minimum by the loose mounting of therolls.

As has been stated, the machine is especially designed for cuttingmaterial for making patterns which are of course always more or lessirregular in outline, having some straight edges and other edges whichare curved to different degrees of radii. Owing to the fact that thespaces at opposite sides of the nip of the knives are entirely open andunobstructed, the sheet of material is free to be turned in difierentdirections as it is passed between the knives to follow different curvedhnes.

I claim:

1. The combination with a pair of rotary shafts, of a beveled-edge diskknife removably attached to the end of each shaft, said knives beingadapted to form coinciding grooves in opposite sides of a sheet, and

means accompanying the knives for compacting the material displacedthereby, the spaces at opposite sides of the nip of the knives beingopen and unobstructed to permit the sheet to be turned in differentdirections as it is operated upon.

2. The combination with a pair of rotary shafts, of a beveled edge diskknife removably attached to the end of each shaft, said knives beingadapted to form coinciding grooves in opposite sides of a sheet, thespaces at opposite sides of the nip of the knives being open andunobstructed to permit the sheet to be turned in different directions asit is operated upon, and pressure rolls located beside the knives andadapted to bear simultaneously on the sides of the sheet.

3. The combination with a pair of rotary shafts, of a beveled edge diskknife removably attached to the end of each shaft, said knives beingadapted to form coinciding grooves in opposite sides of a sheet, thespaces at opposite sides of the nip of the knives being open andunobstructed to permit the sheet to be turned in different directions asit is operated upon, and rolls accompanying the knives for compactingthe material displaced thereby, the inner ends of the peripheries of therolls meeting the sides of the knives.

4. The combination with a pair of rotary shafts, of a beveled-edge diskknife removably attached to the end of each shaft, said knives beingeach beveled on both sides to form a cutting edge, and pressure rollslocated beside the knives, the peripheries of the rolls forming obtuseangles with the sides of the knives, the spaces at opposite sides of thenip of the knives being open and unobstructed to permit the sheet to beturned in different directions as it is operated upon.

5. A pair of opposed rotary disk knives adapted to form coincidinggrooves in opposite sides of a sheet, and loose pressure rolls locatedbeside the knives, and adapted to rotate independently of the knives.

6. A pair of opposed rotary disk knives adapted to form coincidinggrooves .in opposite sides of a sheet, and two pairs of loose pressurerolls located at opposite sides of the knives, and adapted to rotateindependently of the knives.

In testimony whereof I have aflixed my signature, in presence of twowitnesses.

ALBERT F. PRESTON.

Witnesses:

O. F. BROWN, I. W. PEZZETTI.

